Working great so far. Although it may need to be made a little lower. My hot end seems to have a harder time maintaining temperature since I put it on. I even moved it down as far as possible. A little blurry but I was printing when I took the picture. Lol.

Used for a couple of weeks, worked great in my opinion but noticed frequently changes and drops in nozzle temperature. I will keep this fan duct in my list because I love the looks of it and anyway was pretty effective!

Hello,
I have made this design and i thanks you for sharing.
after trying it, fit very nice on the machine but i change of item cause i feel like it's not blowing enough (too much holes).
But fit great and make the job.
++
Chris

I've made more than one of these. Love this thing! I did have to drill some new holes in my mounting bracket to get it to align properly around my nozzle, but it was well worth it. This thing makes for awesome prints. I also love that it is a tool-less assembly. I can snap it on and off to access the hot end.

So far this thing has made the biggest improvement to my print quality, thanks for sharing, I printed another one using the original first one the difference is amazing, I guess the stock nozzle is so bad. I am quite new to this so I have not got around to playing with the settings much, but this helped me no end

love this thing. If anyone is having a problem where their filament will randomly get reversed out of the extruder then your printer will try to start extruding again and print without extruding I found that the solution is printing with the SD card and not the cable straight to the computer. No idea why this fixed my issue, but it did. Also try reducing your retraction distance to 2.5mm.

I'm having the cooling problems a lot of people are talking about. I've not gotten in to the modeling side of things quite yet - I want to get the slicer/printer thing down first, doing upgrades others have taken time to craft. Mosfets are in the mail on their way

A few things I see to suggest repair:
Moving the nozzle "up" in the extruder by tightening the threads up. Then reset Z height.
Slide the nozzle "down" on the fan and clamp in place with the screws.
Make a taller version from this model in fusion360

This thing is definitely worth it, although it took me a second to figure out how to mount it on the fan because the one I used before went inside of the fan output instead of on top of it like this one.

Works great. It was my first print and 2nd. The first broke loose of the bed 3/4 through. Printed the second with a raft. But since I installed this (and leveled the bed better, at temp) I haven't needed a raft. I noticed the temp problems others complained about but I saw it with the shipped nozzle too. That's probably the reason many suggest the mosfet upgrade. No fan and it gets up to temp, 25% or more fan and it struggles. I pushed the temp to 220 and it holds at 215 with your nozzle printing PLA.

Because this goes around the outside of the fan you have to loosen the fan so it can fit between the fan and extruder. Probably an obvioious observation, but just throwing it out there.

Hi!
I need this fan duct with an air outlet 6mm lower than it is. If I mount this fan duct on my A8 the air is blown directly onto the nozzle. So I cannot reach a higher temperature than 180°C. When my nozzles touches the heat bed the fan duct stands 6mm above the glass. :(

I have a lite problem with this fan duct, when im printing a wall object i clearly see that wall side that is not facing fan looks worse, just like PLA wast not cooled enough while printing from that side, what you suggest i should take nozzle higher to relative fan position or lower ?

I have the same question as GeneticCheatah. The acrylic thickness of my sensor mount is 5mm. So I think a 5 mm extension of the part between the mount and the semi circle would do the trick. Could you make me such a version?

Could you design a slightly extended version so it’s still alligned with the nozzel after installing an auto bed level sensor mount? The acrylic thickness of the mount pushes the fan further away by about 2mm and I don’t want it to ruin the affectiveness of the fan duct

The reason you give for creating this Thing (circular one falling after some time) is the exact reason I came looking for this one. The other one wasted a two hours' print and 20g of plastic. Thank you very much!

sliced on cura 2.6.1 no stress, this was my second print and two things about it amazed me. 1. those supports that just snap away .. how does it know>? Magic! and suddenly I am able to be in the same room as the printer without industrial strength air protection. THIS is the best upgrade of all the upgrades I have because without it I would probably never print anything due to the pain generated by the standard fan.

Hi,
I'm using its circular cousin, but sadly, as i have a plate for my auto levelling sensor, all the fan ducts are offset from the extruder nozzle...
Would you be kind enough to design one with a 3.8 mm longer "neck" thing?
Thank you.

Link to area I believe Loico says needs to be extended to accommodate the "stock" Anet leveling sensor bracket. Area between the yellow lines is what is to be extended. That having been said, I'm using it with that sensor and bracket and it works fine, but this "lost reach" is pushing all of my OCD buttons. ;)

Not sure if the bracket is 3.8mm or 3mm thick, I can measure when I get home, unless someone beats me to it. The bracket installs between the fan and the extruder, so it "pulls" the fan duct towards the front of the printer by the thickness of the mount. This is the sensor and mount in question.

Oh thanks. I only noticed now that Thingiverse ate my link for some reason.
I used a caliper to measure the plate between the fan and the extruder motor. It showed 3.8 precisely. But it may depend fomr one manufacturer to another maybe.

Sorry for the late response, I had ton print it and test it on a couple of prints.
As many said, it blows quite high and lower the extruder's head temperature a bit, but works like a charm with the 3.8mm offset.

I made this and had the same cooling issue. Temps were very unstable. My extruder tip is screwed out just enough so the stock white fan duct clears the bed while printing. No more, no less. I went back the the stock fan duct.

I have to retract my previous post about what I said above. It turns out the unstable temps were NOT caused by this fan duct. Instead it was due to me not changing the power supply from 240 vdc to 120 vdc. While sorting my new A8 out I measured to output voltage of the power supply. It was measuring less than 9 vdc instead of 12 vdc. Once I flipped the power supply switch from 240 to 120 everything changed. My bed as well as the nozzle now heat up 3x faster. Today the cooling fan duct has no effect on the nozzle temp. I'm just glad I didn't damage anything. I'm surprised my A8 worked at all.

Maybe your nozzle / throat / heat block is not mounted properly e.g. it is too low.
It also helps a lot and is highly recommended (no matter what fan duct you use) if you run PID auto tune when you install new fan duct - the temperatures are much stable afterwards.
Anyway, I'm working on a different new fan duct now, so keep an eye :)

I made one... and even when it's near perfectly level with the nozzle tip (added 6mm height for mine, thanks for including blender file!) it blows too directly and cools the head. Fan speed reduced to 75% max 50% min seems to work... but not ideal. Air holes should point slightly more down angled to avoid cooling the head itself so badly.

By far the best fitting and usable fan duct I've found for the Anet A8. I've tried about 4 or 5 other circular designs on here, but they all warped after the first print and one was so big it would hit the left Z rod when it would go to home. You do have to remove the fan to put this on, but it is only two screws and takes like 30 seconds. I printed mine with PLA at 0.2mm layer height with 100% infill.

Note: You must remove the front fan and shove (read: rather forcefully) this piece over the airflow opening, then re-mount the fan to the extruder unit. Not a major inconvenience, but something to be aware of.

A tip for improving the model: Make the hollow channel on the side wall go straight through the top, this would have made installation a bit easier.

I've had better luck with Slic3r than Cura, in Repetier, on mine. Cura won't even insert M190/M104 heatup in the G code for me or any temp changes. Only problem I've had is getting bridging to work right but I'm thinking it's cooling/fan related more than settings... 30mm/s with a 0.5 bridge flow ratio is what I'm using now with the full circular duct... hoping this duct fixes it so I can go back to 1 bridge flow ratio. Did you get the 0.4 nozzle version? I replaced the nozzle mine came with as well, using a .3 right now and the quality is insanely better.

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